The hypothesis of this study is that Magnesium sulfate pretreatment (50mg/kg) will reduce the
incidence of cough and chest wall rigidity caused by remifentanil administration.
The purpose of this study was to investigate the effect of magnesium sulfate administered
before induction of anesthesia on thoracic stiffness and cough response caused by opioid
analgesics administered for general anesthesia.